================================================================== BUG: KASAN: slab-out-of-bounds in mcp2221 BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x110d/0x1140 drivers/hid/hid-mcp2221.c:975 Read of size 1 at addr ffff888116477fff by task syz.0.1798/12482 CPU: 1 UID: 0 PID: 12482 Comm: syz.0.1798 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 mcp2221_raw_event+0x110d/0x1140 drivers/hid/hid-mcp2221.c:975 __hid_input_report.constprop.0+0x319/0x470 drivers/hid/hid-core.c:2175 hid_irq_in+0x55d/0x710 drivers/hid/usbhid/hid-core.c:287 __usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 dummy_timer+0xdb2/0x3700 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x42/0xb0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0033:0x7f4bff4cb3b4 Code: f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 83 ec 08 <48> 89 fa 48 89 f1 31 ff 31 f6 e8 7d 04 02 00 85 c0 75 09 48 83 c4 RSP: 002b:00007f4bfdef5f80 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000009 RCX: 0000000000000000 RDX: 0000000000000009 RSI: 0000000000000000 RDI: 00007f4bfdef5f90 RBP: 0000000000000003 R08: 00007f4bff850320 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00002000000000c0 R13: 0000000000000000 R14: 00007f4bff725fa0 R15: 00007ffdcbab6a88 Allocated by task 6107: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kvmalloc_node_noprof+0x341/0x950 mm/slub.c:7005 seq_buf_alloc fs/seq_file.c:39 [inline] seq_read_iter+0x819/0x1270 fs/seq_file.c:211 kernfs_fop_read_iter+0x46c/0x610 fs/kernfs/file.c:290 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x82e/0xb40 fs/read_write.c:574 ksys_read+0x12a/0x250 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6107: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x43/0x70 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x20c/0x650 mm/slub.c:6792 seq_release+0x4b/0x80 fs/seq_file.c:356 kernfs_fop_release+0xf4/0x1f0 fs/kernfs/file.c:777 __fput+0x3ff/0xb50 fs/file_table.c:512 fput_close_sync+0x118/0x250 fs/file_table.c:617 __do_sys_close fs/open.c:1560 [inline] __se_sys_close fs/open.c:1545 [inline] __x64_sys_close+0x8b/0x120 fs/open.c:1545 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888116476000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 4095 bytes to the right of allocated 4096-byte region [ffff888116476000, ffff888116477000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116470 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888116471011 flags: 0x200000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0200000000000040 ffff88810004b500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000300040004 00000000f5000000 ffff888116471011 head: 0200000000000040 ffff88810004b500 dead000000000100 dead000000000122 head: 0000000000000000 0000000300040004 00000000f5000000 ffff888116471011 head: 0200000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6107, tgid 6107 (udevd), ts 967771829057 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0xf4b/0x3440 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2d7/0x2f70 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7410 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kvmalloc_node_noprof+0x71a/0x950 mm/slub.c:7005 seq_buf_alloc fs/seq_file.c:39 [inline] seq_read_iter+0x819/0x1270 fs/seq_file.c:211 kernfs_fop_read_iter+0x46c/0x610 fs/kernfs/file.c:290 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x82e/0xb40 fs/read_write.c:574 ksys_read+0x12a/0x250 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 14 tgid 14 ts 967763311135 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x714/0xfc0 mm/page_alloc.c:2962 skb_kfree_head net/core/skbuff.c:1083 [inline] skb_free_head+0xb9/0x160 net/core/skbuff.c:1095 skb_release_data+0x6c5/0x8e0 net/core/skbuff.c:1122 skb_release_all net/core/skbuff.c:1197 [inline] __kfree_skb net/core/skbuff.c:1211 [inline] sk_skb_reason_drop+0x102/0x1b0 net/core/skbuff.c:1250 kfree_skb_reason include/linux/skbuff.h:1323 [inline] kfree_skb include/linux/skbuff.h:1332 [inline] ath9k_hif_usb_rx_cb+0x812/0x1340 drivers/net/wireless/ath/ath9k/hif_usb.c:729 __usb_hcd_giveback_urb+0x38e/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 dummy_timer+0xdb2/0x3700 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 run_ksoftirqd kernel/softirq.c:1099 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1091 smpboot_thread_fn+0x3d3/0xab0 kernel/smpboot.c:160 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888116477e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888116477f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888116477f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888116478000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888116478080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================